Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba6388c7e9da0e7…

MALICIOUS

PDF

45.2 KB Created: 2020-10-14 12:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 43ed09bdaef672f7a07e2a9582cdc2ff SHA-1: 5dc7a0b9f07f8dc193ddef383c8598b3199d23b5 SHA-256: 7ba6388c7e9da0e74db6d67d23032acab057a3b4c5c0459ae1b1cbb307e85658
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and potentially malicious content farms. The primary embedded URL, 'https://cctraff.ru/strik?keyword=fish+body+parts+worksheet+for+kindergarten', is identified as a malicious redirector. This suggests the document is designed to lead users to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=fish+body+parts+worksheet+for+kindergarten In PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/gapovowumepekegosiza.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/8767144.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/3409757.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3532345.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5058540.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/geometric_probability_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6354/9338/files/amoeba_sisters_autotrophs_and_heterotrophs_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7623/6950/files/lusafofuxexirididolisobe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/1478/7740/files/frozen_piano_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4827/4582/files/xewuvinimesuveziluvojis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1587/2927/files/kozulexif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6490/0763/files/ejemplos_de_debilidades_de_una_empresa_foda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1747/7019/files/ramemuwiwipoke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/true_and_correct_copy_nz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7125 5624 bytes
SHA-256: d80b096cd7c52eb7c4329250b79eb880c224f4674530815709568d26f5db61aa
font_01_sfnt_off00008453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8453 10344 bytes
SHA-256: 28e4a436f9023c9a534dd2b1a15e4e1b19aae126b03143289fe805a7e279ed06

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